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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f29e2b99062b9709e8bbdeeaf5de27a7f43887a71a9c6e27ace0ecfa0c9e877' 
  AND token = 'Sdp8w3phuTDeoFhJVs7X2/NpYO6uj2f+MGExDA4CpO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}